Re: Kernel trace on Linux distro called YOCTO

Re: Kernel trace on Linux distro called YOCTO

[Jonathan Rajotte-Julien]

Hi Alin,

If I'm not mistaken, we had a *debugging* session on IRC together regarding
this.

From what I gather it was mostly a library lookup problem for lttng-consumerd.

Please post a summary of the solution here just in case even if it does not
seem to be directly lttng's fault so far.

Cheers.

On Thu, Jun 06, 2019 at 10:21:10PM +0000, Stanciu, Alin wrote:
> Hi,
> 
> I'm trying to use LTTng to trace Linux events on a Linux distro called YOCTO.
> Using the following commands, I do not get any kernel events in the LTTng trace
> 
> "
> lttng create my-kernel-session --output=/tmp/my-kernel-trace
> lttng enable-channel test --kernel --subbuf-size=10000000
> lttng enable-event --kernel --all -c test
> lttng add-context -k -t vpid -t vtid -t procname
> lttng start
> "
> 
> The resulting trace is empty.
> 
> No matter what I try, I can't seem to get any kernel events thorough to LTTng.
> 
> Using v2.8.8.
> 
> Any ideas?
> 
> Thanks in advance.
> 
> Best Regards,
> alin stanciu
> Assistant Software Team Manager

-- 
Jonathan Rajotte-Julien
EfficiOS

Re: Kernel trace on Linux distro called YOCTO

[Stanciu, Alin]

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Hello Jonathan,

Indeed, it was a library lookup problem, certainly not a problem with LTTng.

Attached is the solution. 

Many Thanks for the help.

Kind Regards,

ALIN STANCIU
Assistant Software Team Manager

T: +44(0)1803.546.306  | M: 07518.071.507
Alin.Stanciu@spirent.com | www.spirent.com
Aspen Way, Yalberton Industrial Estate, Paignton, U.K. TQ47QR
   

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-----Original Message-----
From: Jonathan Rajotte-Julien <jonathan.rajotte-julien@efficios.com> 
Sent: 07 June 2019 22:33
To: Stanciu, Alin <Alin.Stanciu@spirent.com>
Cc: lttng-dev@lists.lttng.org
Subject: Re: [lttng-dev] Kernel trace on Linux distro called YOCTO

Hi Alin,

If I'm not mistaken, we had a *debugging* session on IRC together regarding this.

From what I gather it was mostly a library lookup problem for lttng-consumerd.

Please post a summary of the solution here just in case even if it does not seem to be directly lttng's fault so far.

Cheers.

On Thu, Jun 06, 2019 at 10:21:10PM +0000, Stanciu, Alin wrote:
> Hi,
> 
> I'm trying to use LTTng to trace Linux events on a Linux distro called YOCTO.
> Using the following commands, I do not get any kernel events in the 
> LTTng trace
> 
> "
> lttng create my-kernel-session --output=/tmp/my-kernel-trace lttng 
> enable-channel test --kernel --subbuf-size=10000000 lttng enable-event 
> --kernel --all -c test lttng add-context -k -t vpid -t vtid -t 
> procname lttng start "
> 
> The resulting trace is empty.
> 
> No matter what I try, I can't seem to get any kernel events thorough to LTTng.
> 
> Using v2.8.8.
> 
> Any ideas?
> 
> Thanks in advance.
> 
> Best Regards,
> alin stanciu
> Assistant Software Team Manager

--
Jonathan Rajotte-Julien
EfficiOS

[-- Attachment #2: enable_kernel_tracing_history.txt --]
[-- Type: text/plain, Size: 4405 bytes --]

  575  uname -r
  576  4.4.113-yocto-standard
  577  lttng create my-kernel-session --output=/tmp/my-kernel-trace
  578  lttng enable-channel test --kernel --subbuf-size=10000000
  579  lttng enable-channel test --kernel
  580  lttng --version
  581  lttng (LTTng Trace Control) 2.8.8 - Isseki Nicho
  582  lttng enable-event --kernel --all -c test
  583  lttng add-context -k -t vpid -t vtid -t procname
  584  lttng start
  585  mkdir test
  586  rmdir test
  587  lttng-sessiond -vvv
  588  cd /tmp/my-kernel-trace
  589  ls -l
  590  cd /mnt/spirent/posapp/share/posapp/software/V6_06_00/engine
  591  lttng stop
  592  lttng destroy
  593  ps aux | grep engine
  594  service posapp_engine restart
  595  ps aux | grep engine
  596  ps aux | grep engine
  597  service posapp_engine restart
  598  service posapp_engine restart
  599  systemctl stop lttng-sessiond.service
  600  systemctl 
  601  service lttng-sessiond.service stop
  602  service lttng-sessionde stop
  603  service lttng-sessiond stop
  604  service list
  605  service lttng-sessiond stop
  606  cd /etc/init.d/
  607  ls -l
  608  find . -name lttng*
  609  find . -name "lttng*"
  610  ps aux | grep lttng
  611  kill -9 1788
  612  lttng-sessiond -vvv --verbose-consumer > log.txt 2>&1 &
  613  cat log.txt 
  614  lttng create
  615  lttng enable-event -k -a
  616  lttng enable-event -k -a
  617  lttng start
  618  sleep 1
  619  lttng stop
  620  cd /home/root/lttng-traces/
  621  ls
  622  cd auto-20190607-173618/
  623  ls -l
  624  pwd
  625  ls -l
  626  uname -r
  627  uname -a
  628  cd /etc/init.d/
  629  ls -l
  630  cat log.txt 
  631  cd /
  632  find / -name liburcu-common.so.5
  633  cp /usr/local/lib/liburcu-common.so.5 /usr/lib
  634  ls -l /usr/lib
  635  find / -name "libunwind*"
  636  ldd /usr/local/lib/lttng/libexec/lttng-consumerd
  637  find / -name libc.so.6
  638  cp /usr/local/lib/liburcu-common.so.5 /lib
  639  find / -name liburcu.so.5
  640  cp /usr/local/lib/liburcu.so.5 /lib
  641  find / -name liblttng-ust-ctl.so.2
  642  cp /usr/local/lib/liblttng-ust-ctl.so.2 /lib
  643  find / -name liburcu-cds.so.5 
  644  cp /usr/local/lib/liburcu-cds.so.5 /lib
  645  ldd /usr/local/lib/lttng/libexec/lttng-consumerd
  646  find / -name  linux-vdso.so.1 
  647  find / -name linux-vdso.so.1 
  648  find / -name  libxml2.so.2
  649  cp /usr/local/lib/liburcu-common.so.5 /usr/lib64
  650  cp /usr/local/lib/liburcu.so.5 /usr/lib64
  651  cp /usr/local/lib/liblttng-ust-ctl.so.2 /usr/lib64
  652  cp /usr/local/lib/liburcu-cds.so.5 /usr/lib64
  653  ldd /usr/local/lib/lttng/libexec/lttng-consumerd
  654  find / -name liburcu-bp.so.5
  655  cp /usr/local/lib/liburcu-bp.so.5 /usr/lib64
  656  ldd /usr/local/lib/lttng/libexec/lttng-consumerd
  657  clear
  658  lttng stop
  659  lttng stop
  660  lttng stop
  661  lttng stop
  662  cd /mnt/spirent/posapp/share/posapp/software/V6_06_00/engine/
  663  find / -name lttng-sesssiond
  664  find / -name lttng-sesssiond
  665  find / -name lttng-*
  666  find / -name lttng-*sess*
  667  find / -name lttng-*sessiond*
  668  ldd lttng-sessiond
  669  ldd /home/root/lttng-tools-2.8.8/src/bin/lttng-sessiond
  670  ldd /usr/local/bin/lttng-sessiond
  671  clear
  672  lttng create
  673  lttng enable-event -k -a
  674  lttng start
  675  sleep 1
  676  lttng stop
  677  cd /home/root/lttng-traces/auto-20190607-175432
  678  ls -l
  679  find / -name log.txt
  680  ps aux | grep *sessiond
  681  ps aux 
  682  ps aux | grep *sessiond*
  683  ps aux | grep *lttng*
  684  lttng status
  685  lttng stop
  686  ps aux | grep
  687  ps aux
  688  ps aux | grep "lttng*"
  689  kill -9 8850
  690  lttng create
  691  lttng enable-event -k -a
  692  lttng start
  693  sleep 1
  694  lttng stop
  695  cd  /home/root/lttng-traces/auto-20190607-175725
  696  ls -l
  697  cd kernel/
  698  ls -l
  699  cd ..
  700  cd ..
  701  cp -avr auto-20190607-17 /mnt/spirent/posapp/share/posapp/
  702  cp -avr auto-20190607-17 /mnt/spirent/posapp/share/posapp/
  703  cd auto-20190607-17
  704  ls -l
  705  cd auto-20190607-175725/
  706  ls -l
  707  cd ..
  708  cp -avr auto-20190607-175725/ /mnt/spirent/posapp/share/posapp/
  709  lttng stop
  710  lttng destroy
  711  cp -avr auto-20190607-175725/ /mnt/spirent/posapp/share/posapp/
  712  pwd
  713  cd /mnt/spirent/posapp/share/posapp/software/V6_06_00/engine/
  714  history > history.txt

[-- Attachment #3: enable_kernel_tracing_history.txt --]
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  575  uname -r
  576  4.4.113-yocto-standard
  577  lttng create my-kernel-session --output=/tmp/my-kernel-trace
  578  lttng enable-channel test --kernel --subbuf-size=10000000
  579  lttng enable-channel test --kernel
  580  lttng --version
  581  lttng (LTTng Trace Control) 2.8.8 - Isseki Nicho
  582  lttng enable-event --kernel --all -c test
  583  lttng add-context -k -t vpid -t vtid -t procname
  584  lttng start
  585  mkdir test
  586  rmdir test
  587  lttng-sessiond -vvv
  588  cd /tmp/my-kernel-trace
  589  ls -l
  590  cd /mnt/spirent/posapp/share/posapp/software/V6_06_00/engine
  591  lttng stop
  592  lttng destroy
  593  ps aux | grep engine
  594  service posapp_engine restart
  595  ps aux | grep engine
  596  ps aux | grep engine
  597  service posapp_engine restart
  598  service posapp_engine restart
  599  systemctl stop lttng-sessiond.service
  600  systemctl 
  601  service lttng-sessiond.service stop
  602  service lttng-sessionde stop
  603  service lttng-sessiond stop
  604  service list
  605  service lttng-sessiond stop
  606  cd /etc/init.d/
  607  ls -l
  608  find . -name lttng*
  609  find . -name "lttng*"
  610  ps aux | grep lttng
  611  kill -9 1788
  612  lttng-sessiond -vvv --verbose-consumer > log.txt 2>&1 &
  613  cat log.txt 
  614  lttng create
  615  lttng enable-event -k -a
  616  lttng enable-event -k -a
  617  lttng start
  618  sleep 1
  619  lttng stop
  620  cd /home/root/lttng-traces/
  621  ls
  622  cd auto-20190607-173618/
  623  ls -l
  624  pwd
  625  ls -l
  626  uname -r
  627  uname -a
  628  cd /etc/init.d/
  629  ls -l
  630  cat log.txt 
  631  cd /
  632  find / -name liburcu-common.so.5
  633  cp /usr/local/lib/liburcu-common.so.5 /usr/lib
  634  ls -l /usr/lib
  635  find / -name "libunwind*"
  636  ldd /usr/local/lib/lttng/libexec/lttng-consumerd
  637  find / -name libc.so.6
  638  cp /usr/local/lib/liburcu-common.so.5 /lib
  639  find / -name liburcu.so.5
  640  cp /usr/local/lib/liburcu.so.5 /lib
  641  find / -name liblttng-ust-ctl.so.2
  642  cp /usr/local/lib/liblttng-ust-ctl.so.2 /lib
  643  find / -name liburcu-cds.so.5 
  644  cp /usr/local/lib/liburcu-cds.so.5 /lib
  645  ldd /usr/local/lib/lttng/libexec/lttng-consumerd
  646  find / -name  linux-vdso.so.1 
  647  find / -name linux-vdso.so.1 
  648  find / -name  libxml2.so.2
  649  cp /usr/local/lib/liburcu-common.so.5 /usr/lib64
  650  cp /usr/local/lib/liburcu.so.5 /usr/lib64
  651  cp /usr/local/lib/liblttng-ust-ctl.so.2 /usr/lib64
  652  cp /usr/local/lib/liburcu-cds.so.5 /usr/lib64
  653  ldd /usr/local/lib/lttng/libexec/lttng-consumerd
  654  find / -name liburcu-bp.so.5
  655  cp /usr/local/lib/liburcu-bp.so.5 /usr/lib64
  656  ldd /usr/local/lib/lttng/libexec/lttng-consumerd
  657  clear
  658  lttng stop
  659  lttng stop
  660  lttng stop
  661  lttng stop
  662  cd /mnt/spirent/posapp/share/posapp/software/V6_06_00/engine/
  663  find / -name lttng-sesssiond
  664  find / -name lttng-sesssiond
  665  find / -name lttng-*
  666  find / -name lttng-*sess*
  667  find / -name lttng-*sessiond*
  668  ldd lttng-sessiond
  669  ldd /home/root/lttng-tools-2.8.8/src/bin/lttng-sessiond
  670  ldd /usr/local/bin/lttng-sessiond
  671  clear
  672  lttng create
  673  lttng enable-event -k -a
  674  lttng start
  675  sleep 1
  676  lttng stop
  677  cd /home/root/lttng-traces/auto-20190607-175432
  678  ls -l
  679  find / -name log.txt
  680  ps aux | grep *sessiond
  681  ps aux 
  682  ps aux | grep *sessiond*
  683  ps aux | grep *lttng*
  684  lttng status
  685  lttng stop
  686  ps aux | grep
  687  ps aux
  688  ps aux | grep "lttng*"
  689  kill -9 8850
  690  lttng create
  691  lttng enable-event -k -a
  692  lttng start
  693  sleep 1
  694  lttng stop
  695  cd  /home/root/lttng-traces/auto-20190607-175725
  696  ls -l
  697  cd kernel/
  698  ls -l
  699  cd ..
  700  cd ..
  701  cp -avr auto-20190607-17 /mnt/spirent/posapp/share/posapp/
  702  cp -avr auto-20190607-17 /mnt/spirent/posapp/share/posapp/
  703  cd auto-20190607-17
  704  ls -l
  705  cd auto-20190607-175725/
  706  ls -l
  707  cd ..
  708  cp -avr auto-20190607-175725/ /mnt/spirent/posapp/share/posapp/
  709  lttng stop
  710  lttng destroy
  711  cp -avr auto-20190607-175725/ /mnt/spirent/posapp/share/posapp/
  712  pwd
  713  cd /mnt/spirent/posapp/share/posapp/software/V6_06_00/engine/
  714  history > history.txt

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Kernel trace on Linux distro called YOCTO

[Stanciu, Alin]

[-- Attachment #1.1.1: Type: text/plain, Size: 1548 bytes --]

Hi,

I'm trying to use LTTng to trace Linux events on a Linux distro called YOCTO.
Using the following commands, I do not get any kernel events in the LTTng trace

"
lttng create my-kernel-session --output=/tmp/my-kernel-trace
lttng enable-channel test --kernel --subbuf-size=10000000
lttng enable-event --kernel --all -c test
lttng add-context -k -t vpid -t vtid -t procname
lttng start
"

The resulting trace is empty.

No matter what I try, I can't seem to get any kernel events thorough to LTTng.

Using v2.8.8.

Any ideas?

Thanks in advance.

Best Regards,
alin stanciu
Assistant Software Team Manager

T: +44(0)1803.546.306  | M: 07518.071.507
Alin.Stanciu@spirent.com<mailto:Alin.Stanciu@spirent.com> | www.spirent.com<http://www.spirent.com/>
Aspen Way, Yalberton Industrial Estate, Paignton, U.K. TQ47QR
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Spirent Communications e-mail confidentiality.
This email and the information contained therein may contain private, confidential or privileged material solely meant for the intended recipient. If you are not the intended recipient review, copying or distribution is forbidden. Further, if you are not the intended recipient, please contact the sender immediately and permanently delete this email and any copies or attachments.


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